(function(onLoad) {   
    try {   
        window.addEventListener('load', onLoad, false);   
    } catch (e) {   
        window.attachEvent('onload', onLoad);   
    }   
})(function() {   
  var tags = ["img","input"];   
  for( var i=0, len=tags.length; i<len; i++ ) {   
    var over = function() { this.src = this.src.replace('_off.', '_on.'); };   
    var out  = function() { this.src = this.src.replace('_on.', '_off.'); };   
    var el = document.getElementsByTagName(tags[i]);   
    for (var j=0, len2=el.length; j<len2; j++) {   
      var attr = el[j].getAttribute('src');   
      if (!el[j].src.match(/_off\./)&&attr) continue;   
      el[j].onmouseover = over;   
      el[j].onmouseout  = out;   
    }   
  }   
});